# 2.4. How to Get New Components

The main site for KDE is `http://www.kde.org`. Here, you can find all important information relating to KDE, including announcements, bugfixes, developer info, style guides, a considerable amount documentation (including the newest version of this book), and much more. For software upgrades, please visit our ftp site, `ftp://ftp.kde.org` or use a mirror if one exists near you.

The directory `unstable` always contains brand new software, but it often is untested and may not even compile. If you are looking for more reliable components, please take a look in the `stable` directory, where we put Beta and release versions.

If you are interested in developing KDE applications on your own, you should also visit Troll Tech's server (`http://www.troll.no`) which features a great deal of information concerning the Qt library used by KDE. For development work, it is also advisable to join the developer's mailing list.